Improvement in sectional tubular boilers



UNITED STATES 'PATENT OFFICE WILLIAM H. DOUGHERTY, or NEwYoRK, N. Y.

IMPROVEMENT IN SECTIONAL TUBULAR BOlL-ERS.

Specification forming part of Letters Patent No. l 76,129, dated April 18, 1876; application filed March 1, 1876.

To all whom it may concern: Y

Be it known that I, WILLIAM H. DOUGH ERTY, of New York city, in the State of New York, have invented certain new and useful Improvements in the Construction of Sectional Boilers, ot" which the following is a specication My improved boiler is formed ot' sections extending across the length of the boiler, and discharging the steam, as fast as generated, intoa capacious drum or separating-vessel, which may be of boiler-iron, double-riveted, or otherwise formed to endure a high pressure with safety. The general form and` most of the details of the boiler may be as shown in the patent to David Rensh aw, October 2l, 1873. But I have found a difculty in the construction ofthe upper portionl ot' the said Renshaw boiler, which this invention is intended to obviate. In the Renshaw patent the several sections are Iall connected to the drum, and any imperfection in the workmanship, or any irregular contraction or expanA sion, tends to induce a bad joint at the place of junction. I have improved the construe. tion by connecting together the several sections below the drum, and connecting the whole to the drum at only a few points, preferably at the ends alone.

The accompanying drawings form a part of this specification, and represent what I consider the best means of carrying out the invention.

Figure 1 is a vertical section on the line S S in Fig. 2. Fig. lA is an end elevation ot' a portion. Fig. 2 is a longitudinal section on i the irregular line T T, a portion being on the central line U U, as will be readily under stood.

Similar letters of reference indicate like parts in all the figures. y

A Al A2 represent the several sections, formed of oastiron, and secured firmly together when in use. AL A1 are short lengths of a longitudinal channel or passage formed in the upper portions of the several sections A, and forming a capacious and easy passage for the steam, or the mingled steam and water rising in the central sections, to allow the said iluid or iuids to flow freely in either D are inverted T-shaped castings, each formed r withsuitable bends and flanges, for a junction at theupper end Vwith a proper orilice in the end-of the drum C, and at the ends ot' the horizontal branches below, for proper junctions with the longitudinal passages A2.,

It will be understood that the sections may be increased or diminished in number, at pleasure, care being taken to provide adrum, (l, of corresponding length.

In constructing long boilers formed of many sections, there may be one or more intermediate connections between the parts Al and the drum C. For ordinary short boilers I prefer the connections at the ends alone.

My construction greatly simplifies the f1tting up and putting together ofthe parts.

These several sections A Al A2 may be faced rapidly and perfectly on a common planer. The sections may be held together by bolting through the flanges.

Each junction-piece D may be faced on a planer at a single operation, for its junction both with the passages AI and with the drum C.

The improvement avoids the fmaking of joints in other planes, which would involve a slow treatment of each section.

The parts are sure to come together correctly, or in case of bad workmanship, or the warping or distortion ot' any part, but little labor is required to bring the parts into position, or to make the other parts conform thereto.

The mass of sections may spring or become distorted in various directions-as, for instance, the central sections may warp upward or downward relatively to the end sections, and no injury will result.

I claim as my invention- The within-described improvement in seetional boilers, having the junctions A1 at the 2 IWSJQQ top, in combinationwith sections A, standing my hand this 26th dey of February, 1876, in elosswise of the structure, and with the drum the presence Ot' two' Subscribing Witnesses. C, standing' lengthwise of the structure, provided with the connections D, all adapted to WM. H. DOUGHERTY.

serve es and for the purposes herein sp'eci- Witnesses:

lied. y R. HENRY GENTNER,

In testimony whereof I have heeul'i't' seu C.A C, STETseN. 

